With Verizon launching the iPhone 4 today ATT is getting more competitive with its mobile calling plans. The company has introduced unlimited mobile calling to any mobile number in America. Unlimited Mobile to Any Mobile is available to ATT customers with an unlimited messaging plan and a qualifying voice plan. Here is more info:

Beginning today, Mobile to Any Mobile will be available to new and existing ATT customers with a qualifying voice plan who subscribe to unlimited messaging plans. Existing customers with an unlimited messaging plan can activate Mobile to Any Mobile by visiting www.att.com/anymobile

Unlimited messaging is available for $20 per month on an individual plan and $30 per month for a FamilyTalk Plan, which allows for up to five lines.